The Command design-pattern is very important and widely used in the XAML and MVVM world. RadDataGrid strictly follows these best practices and provides an intuitive and easy-to-use set of APIs that allow different aspects of the RadDataGrid control’s behavior to be handled and/or completely overridden.
RadDataGrid exposes a Commands collection that allows you to register custom commands with each control’s instance through the RadDataGrid.Commands property:
- Commands: Gets the collection with all the custom commands registered with the CommandService. Custom commands have higher priority than the built-in (default) ones.
There are two types of commands:
DataGridCommand: All the default commands within RadDataGrid derive from the base DataGridCommand. Think of this command as a UI-related command as it operates over the RadDataGrid instance that owns the command.
- Id: Gets or sets the CommandId member this command is associated with.
- Command: Gets or sets the generic ICommand implementation that may come from the ViewModel.
EnableDefaultCommand: Gets or sets a value indicating whether the default (built-in) UI command associated with the specified Id will be executed. Default value is True.
All the predefined commands within a RadDataGrid instance are identified by a member of the DataGridCommandId enumeration. This is actually the key that relates a command instance to a particular action/routine within the owning grid. In order to register a custom command within a RadDataGrid instance you may either inherit the DataGridCommand class and override its CanExecute and Execute methods. You need to set the Id property of the new command so that it can be properly associated with the desired action/event. Following are the members of the DataGridCommandId enumerations: